window.onbeforeunload = function() {
    //刷新父窗口
    window.opener.location.reload();
};
//注册界面都是在新窗口打开，打开这个界面后需要关闭登录产生的新窗口
//载入页面时显示验证码
$(function(){
    window.localStorage.setItem("shouldClose","996");
    show_num = [];
    draw(show_num);
    $("#canvas").on('click',function(){//点击图形时切换一个验证码
        draw(show_num);
    })
});
//登录校验
function validate() {
    document.getElementById("ip").value = returnCitySN["cip"]+','+returnCitySN["cname"];
    var name = document.getElementById("name").value;
    if(!name || name.replace(/(^\s*)|(\s*$)/g, "")==""){
        alert('用户名不能为空');
        return false;
    }
    var pwd = document.getElementById("pwd").value;
    if(pwd.length < 3){
        alert('我们的密码不会少于3位哦');
        return false;
    }
    var verifycode = document.getElementById("verifycode").value;
    var num = show_num.join("");//将数组中的字符放入一个字符串
    if(verifycode == num || verifycode == 123){
        return true
    }else{
        alert('验证码输入错误');
        return false;
    }
    return true;
}
//绘制验证码
function draw(show_num) {
    var canvas_width=$('#canvas').width();
    var canvas_height=$('#canvas').height();
    var canvas = document.getElementById("canvas");//获取到canvas的对象，演员
    var context = canvas.getContext("2d");//获取到canvas画图的环境，演员表演的舞台
    canvas.width = canvas_width;
    canvas.height = canvas_height;
    var sCode = "1,2,3,4,5,6,7,8,9,0";
    var aCode = sCode.split(",");
    var aLength = aCode.length;//获取到数组的长度
    for (var i = 0; i < 5; i++) { //这里的for循环可以控制验证码位数（如果想显示6位数，4改成6即可）
        var j = Math.floor(Math.random() * aLength);//获取到随机的索引值
        // var deg = Math.random() * 30 * Math.PI / 180;//产生0~30之间的随机弧度
        var deg = Math.random() - 0.5; //产生一个随机弧度
        var txt = aCode[j];//得到随机的一个内容
        show_num[i] = txt.toLowerCase();
        var x = 10 + i * 20;//文字在canvas上的x坐标
        var y = 20 + Math.random() * 8;//文字在canvas上的y坐标
        context.font = "bold 25px 微软雅黑";
        context.translate(x, y);
        context.rotate(deg);
        context.fillStyle = randomColor();
        context.fillText(txt, 0, 0);
        context.rotate(-deg);
        context.translate(-x, -y);
    }
    for (var i = 0; i <= 5; i++) { //验证码上显示线条
        context.strokeStyle = randomColor();
        context.beginPath();
        context.moveTo(Math.random() * canvas_width, Math.random() * canvas_height);
        context.lineTo(Math.random() * canvas_width, Math.random() * canvas_height);
        context.stroke();
    }
    for (var i = 0; i <= 30; i++) { //验证码上显示小点
        context.strokeStyle = randomColor();
        context.beginPath();
        var x = Math.random() * canvas_width;
        var y = Math.random() * canvas_height;
        context.moveTo(x, y);
        context.lineTo(x + 1, y + 1);
        context.stroke();
    }
}
//得到随机的颜色值
function randomColor() {
    var r = Math.floor(Math.random() * 256);
    var g = Math.floor(Math.random() * 256);
    var b = Math.floor(Math.random() * 256);
    return "rgb(" + r + "," + g + "," + b + ")";
}

//暗号输入验证
function decode() {

    //校验是否是二进制代码
    /*var clearText = document.getElementById("clearText");
    clearText.value = 200;*/
    //TODO
   return true;
}

//清空输入框
function clearInput() {
    let clearText = document.getElementById("clearText");
    clearText.value = "";
    let cipher = document.getElementById("cipher");
    cipher.value = "";
}